목적: Calibration of audiometer is essential process that ensures reliability of hearing test results. Hearing thresholds are determined using the average of six frequencies, where even a 5 dB difference can impact the proportion of diagnosed hearing impairment. Since most audiometers in South Korea are imported, hearing professionals recognize the importance of calibration but often lack precise knowledge of inspection methods, leading to reliance on external specialists. This study aims to investigate the nationwide status of audiometry calibration in hospitals. 방법:Audiometer calibration was conducted at 21 hospitals, including 13 metropolitan and 8 regional facilities, covering primary, secondary, and tertiary hospitals. Audiometers such as GSI Pro, Astera2, and AD629 calibrated in accordance with ISO 60645 and 60318 series. Calibration equipment included an artificial mastoid, artificial ear, sound level meter, and microphone. An independent t-test was applied to analyze calibration differences based on hospital level (i.e., primary vs. tertiary) and location (i.e., metropolitan vs. regional). 결과:For the comparison of hospital level revealed significant differences in air conduction (AC) measurements at 0.125, 0.25, 0.5, 1.5, and 4 kHz. For bone conduction (BC) measurements, significant differences were observed at 4 kHz. That is, tertiary hospitals exceeding target levels. For the hospital location, significant AC differences were observed at 0.125, 2, 3, and 6 kHz. In BC, differences were found at 0.25 kHz. The findings of the study indicated that tertiary hospitals demonstrated superior calibration accuracy in comparison to primary hospitals, while metropolitan hospitals exhibited higher performance in calibration metrics when contrasted with regional hospitals. 결론:This study confirms significant calibration differences based on hospital level and location. To ensure accurate and reliable hearing assessments, it is essential to improve the awareness of audiometer calibration.